Got the 14 gauge wire into the bottom seat cover. That job is pretty easy if you put the wire in before you put the cover on the seat. That way when you get to a curve you just hold the curve of the cover area straight, push in the wire and than bend it later. I straighten the wire bending it mostly straight, cut it a little longer than you need, lightly grind the sharp edge from the cut of one end then insert the wire. I bought a 200 foot spool and they have shorter and longer lengths but the larger spools will be less work to straighten.
This 14 gauge is probably way overkill. Maybe a plastic welt may be easier or 17 gauge steel wire.